<template>
  <div id="home" class="wrapper">
    <nav-bar class="home-nav"><div slot="center">购物街</div></nav-bar>
    <tab-control :titles ="['流行','新款','精选']"
                 class="tba-control"
                 @tabClick = "tabClick"
                 ref="tabControl1" v-show="isTabFixed"/>
    <scroll class="content"
            ref="scroll"
            :probe-type="3"
            @scroll="contentScroll"
            :pull-up-load="true"
            @pullingUp="loadMore"
            >
<!--      @pullingUp="loadMore"-->
      <home-swiper :banners="banners" @swiperImageLoad="swiperImageLoad"></home-swiper>
      <recommend-view :recommends="recommends" />
      <feature-view/>
      <tab-control :titles ="['流行','新款','精选']"
                   @tabClick = "tabClick"
                    ref="tabControl2"/>
      <goods-list :goods="showGoods" />
    </scroll>

    <back-top @click.native="backClick" v-show="isShowBackTop"/>
  </div>
</template>

<script>

  import HomeSwiper from "./childComps/HomeSwiper";
  import RecommendView from "./childComps/RecommendView";
  import FeatureView from "./childComps/FeatureView";

  import NavBar from "components/common/navbar/NavBar";
  import TabControl from "components/content/tabControl/TabControl";
  import GoodsList from "components/content/goods/GoodsList";
  import Scroll from "components/common/scroll/Scroll";
  import BackTop from "components/content/backTop/BackTop";

  import {getHomeMultidata,getHomeGoods} from "network/home";
  import {debounce} from "common/utils";


  export  default {
    name: "Home",
    components:{

      HomeSwiper,
      RecommendView,
      FeatureView,
      NavBar,
      GoodsList,
      TabControl,
      Scroll,
      BackTop
    },
    data(){
      return{
        banners:[],
        recommends:[],
        goods:{
          'pop':{page:0,list:[]},
          'new':{page:0,list:[]},
          'sell':{page:0,list:[]},
        },
        currentType:'pop',
        isShowBackTop:false,
        tabOffsetTop:0,
        isTabFixed: false,
        saveY:0
      }
    },
    computed:{
      showGoods(){
        return this.goods[this.currentType].list
      }
    },
    created() {
      //1.请求多个数据
      this.getHomeMultidata()

      //2.请求商品数据
      this.getHomeGoods('pop');
      this.getHomeGoods('new');
      this.getHomeGoods('sell');
    },
      mounted() {
      // 1.图片加载完成的事件监听
        const refresh = debounce(this.$refs.scroll.refresh,500)
        this.$bus.$on('itemImageLoad',()=>{
          refresh()
        })
      },

    methods: {
      //事件监听相关的方法
      tabClick(index) {
        switch (index) {
          case 0:
            this.currentType = 'pop'
            break
          case 1:
            this.currentType = 'new'
            break
          case 2:
            this.currentType = 'sell'
            break
        }
        this.$refs.tabControl1.currentIndex = index;
        this.$refs.tabControl2.currentIndex = index;
      },

      // 点击回到顶部
      backClick() {
        this.$refs.scroll.scrollTo(0, 0)
      },
      contentScroll(position) {
        // console.log(position);
        // 1.判断backtop是否显示
        this.isShowBackTop = (-position.y) > 700
        //2.判断tabControl 是否吸顶
        this.isTabFixed = (-position.y) > this.$refs.tabControl2.$el.offsetTop
      },
      loadMore(){
        // console.log('上拉加载更多')
        this.getHomeGoods(this.currentType)
      },
      swiperImageLoad(){
        console.log(this.$refs.tabControl2.$el.offsetTop);
      },

      // 网络请求相关的方法
      getHomeMultidata() {
        getHomeMultidata().then(res => {
          // this.result = res;

          this.banners = res.data.banner.list;
          this.recommends = res.data.recommend.list;
        })
      },
      getHomeGoods(type) {
        const page = this.goods[type].page + 1
        getHomeGoods(type, page).then(res => {
          this.goods[type].list.push(...res.data.list)
          this.goods[type].page += 1
          // console.log(res);
          this.$refs.scroll.finishPullUp()
        })
      },

    }
  }


</script>

<style scoped>
  #home{
    height: 100vh;
    position: relative;
  }

  .home-nav{
    background-color: var(--color-tint);
    color: #f6f6f6;

    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    z-index: 9;
  }
  .tba-control{
    position: relative;
    z-index: 9;
    top: 44px;
  }
  .content{
    overflow: hidden;
    position: absolute;
    top: 44px;
    bottom: 49px;
    right: 0;
    left: 0;
  }
  /*.content{*/
  /*  height: calc(100% - 93px);*/
  /*  !*overflow: hidden;*!*/
  /*  margin-top: 44px;*/
  /*}*/
</style>